Brake mechanism with removable shoes



J. H. COOMBES ET AL BRAKE MECHANISM WITH REMOVABLE SHOES Sept 1, 1953 Filed May 18, 1949 2 Sheets-Sheet 'l EICTZ S C m m m H W m J y B 5 WiUiamMann.

ATTORNEY Sept. 1, 1953 J. H. COOMBES ET AL BRAKE MECHANISM WITH REMOVABLE SHOES 2 Sheets-Shet 2 Filed May 18, 1949 EICtA:

INVENTORS Joseph +1. Cqombes. William Mann.

A TTORNE Y Patented Sept. 1, 1953 2,650,680 iiRAk'E MECHANISM were Remvimm snons Jase 'n i1". 'Ciibmbes, Jenkilitown; Pa; an Wiuianp Mann, Grosse Pbinte, Mich assignors to The Build Company; Philadelphia, Pm, a; corporation of Pennsylvania Appiieatich May 18, 1949; see-ti No; 93324 4 Claims. 1

The invention relates to disc brakes and; more particularly, to such brakes in wliiEhthe shoes are actuated by levers t6 engage opposite sides of a rotary brake disc. s U s The main object of the invention is t9 simplify the construction and mounting of the shoes associated with such brakes. y 4 U a The heads upon which the shoes are detachably mounted, and the shoes th'ernselvf v 3. so designed as to require heads of two kinds, rights 1efts, to be manufactured to" fit the brakes associated with all four thesis of alisual fourwheel railway truck. The shoes are further -designed so that they are identiealf at thelroppo'site ends and designed to interlock with securing means associated with the opi o'siteends oi the head interchangeably.-

design perr'nits a single form of sho'to fit each bf the eight heads ordinarily present in a four whee'l railway trir'ck brake.

Simplicity of manufacture" and reblacement of the shoes is thus achieved iri'afhigh q greaar a the manner in which this is done" will become apparent from the following det' sqription when read in connection witfitfifiawlngs formmg a part of this specification.

In the drawings: z is a n Vi w. 9 1 en iezr iwey truck equ'ipned with the invention} parts being shown in section; I U W 2 is a f a mentary. e er ii'enely i. a assembled n .heedia dls hee wit a ree.- ment of the s eiei 'd, as sh i amend.- dash lines, the view, representing an emargeine'nt of parts shownin Fig. l as seen when looking the direction of the a'rfowsaeth-e ends or the line 2-4 on saidf figure; x V Fig. 3 is a part eleva on tending side frames, as IO, N), transversely interconnected by transoiii's, as H, and supported at the ends of the side frames by wheel and axle assemblies, as i2. 'Ih'e'vvheel and axle assemblies comprise wheels, as l3, l3, mounted on an axle, as M, and each wheel has secured thereto a brake disc l5.

Mounted on a transverse support beam [8 extending between and carried by the side frames [0, ID are the brake shoes and their actuating means associated with the respective discs.

Generally, the arrangement of shoes and actuating means associated witheach disc are the sarrie. v Each comprises opposed heads 11 and 18 carrying the shoes l9, lil jor engaging the opposite braking faces ofthe' disc I5. These heads H and I8 are pivc'tally carried by the levers 20 m r ere i w.

These levers in" turn are pivotally carried, as at 22, 22 by abracket 23 rigidly secured to the suppdrt beam I6. 'lfhe eiids of the levers beyond their pivots 22 22 and remote from the ends carrying the heads and shoes are shown interconnected by a cylinder actuator 24. When air is admitted between the cylinder and piston of the actuator, the shoes are pressed into engagement with the opposite sidesof the disc toapply the brakes} Qther forms of actuating means could be employed as desired. H y Y As ShoWn'Jheheads l and I8 are mounted on their respective leversgso that they may be readily applied or removedby m ans generally similar to that shown in PatentNOL Z AOZBBB for Brake Mechanish i', issue JunelB", 19461 Such means may comprise a pin 25 preferably having a driven lit with the eye 26 of the adjacent e e e i. eem d to the. lei e e d of this pin is a bearing sleeve 21 en aging an arouate' open bearing 2 8 formed on the back of the head, as I8.

A wear plate, preferably; lines this bearing.

The upper en'dyof the 'pin 25 extends through a closed bearing 29 on the head and projects up w'ardly thereabove toireceive the means for secur ing th S h'OG' and the head in place.

At the bottom, the heads I! and I8,'wh1ch are rights and lefts are formed withdownward ex tensi'ons arranged symmetrically on opposite sides of their centrallongitudinal axis. This symmetrical formation is to adapt either of the heads I and I8 to receive demountably a bracket 30 or 3 l, which bracket serves n'ot only to, hold the: lower end of the shoe associated with the e dinplec iputxaisq nte r l y arr a part of the means which maintains the heads in parallelism in their movement toward and away from the opposite sides of the disc.

As shown in Fig. 3, one of the brackets as 30, is formed with a vertical transversely extended guide slot, and the other, as 3!, is provided with a laterally projecting pin 32 force-fitted in a hole in the bracket 3| and projecting into the guide slot. Each of the brackets is located on and secured to a respective head by a pair of laterally spaced bolts 33, 33, the nuts 34, 34 of which are countersunk into recesses formed in the brackets and heads. Since the connections of the brackets to the heads are symmetricalabout the vertical transverse axis of the heads, it will be seen that the brackets 30 and 3! maybe .secured interchangeably to the heads I! and I8. This arrangement permits the furnishing of the entire four-wheel brake organization with but two forms of heads, namely, rights and lefts.

As shown in Fig. 4, the shoes H) are arcuate in form and have end portions which are similarly formed on opposite sides of the general plane of the sheet metal plate 31 having secured thereto spaced blocks 39 of brake lining material. The lining is removably held in place by projections 40 and retaining wires 4| passing through openings in the projections. Other suitable forms of lining could be used with the backing plate 35 if desired. 7

In view of the form of the shoe and the manner of mounting it removably on the head, it will be seen that but one form of shoe is required, and that it may be mounted interchangeably upon any of the heads.

The face 42 of the head receiving the shoe is flat or planar and adapted to receive the fiat face of the backingplate 35 of the shoe thereagainst.

The brackets 3ii'or 3! each have an upward extension 43 engaging the outer face of the lower edge of the shoe and are further formed with a projection 44 which fits into the notch 36 at the adjacent end of the shoe so that the shoe is securely held in place at this lower end against movement away from the associated head or against movement in a plane parallel thereto. To

similarly securely hold the opposite end of the shoe, the'means' shown in detail in Fig. is provided. In this view, it will be seen that a pair of spaced projections 45 extend upwardly ad- 'on the clamping head at the same time engages the fiat top face of the projection 41, on which it can slide laterally, as required by the action of the cam surfaces 46, 48.

The clamping head 50 is then locked in the position shown in Fig. 3, right, by a springpressed cup washer 53 and a key 54.

To remove the shoe from the head, the key 54 is knocked out, after which the spring-pressed cup washer 53 and the clamping head 50 can be jacent the flat face of the head, which projections have inclined cam faces 46 on their sides away from said face. Opposite the projections 42 is provided a fiat top projection 41 extending in the same general direction as a line joining the projections 45.

These projections 45 and 41 are adapted to cooperate with similar faces, as 48 and 49, formed on a clamping head 50 through a loosely fittin opening in which the securing pin 25 is adapted to pass. The clamping head 50 is also formed with a slotted portion 5| adapted to fit between the ends of the notch 36 in the adjacent end of the shoe, the outer wall of this slotted portion engaging over the outer face of the backing plate removed, and the shoe is can then be upwardly withdrawn from its engagement with the bracket, as 30.

It is believed that the operation of the device can be understood from the foregoing detailed description, and further description is, therefore, deemed superfluous.

While a specific form of the invention has been described in detail, it will be understood that changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention.

What is claimed is:

1. In combination, a rotary brake disc having opposite faces, a brake head carrying a brake shoe designed for cooperation with one of the faces of said rotary brake disc, a similar but opposite such head carrying a brake shoe designed for cooperation with the other face of said disc, the lower ends of the heads being provided with removable and interchangeable similar brackets carrying parts for securing the shoes to the respective heads and further carrying interfitting parts of uiding means designed to maintain'the brake heads parallel to each other and to the rotary brake disc.

2. In combination, a rotary brake disc having opposite faces, a brake head carrying a brake shoe designed for cooperation with one of the faces of said rotary brake disc, a similar but opposite such head carrying a brake shoe designed for cooperation with theother face of said disc, one pair of adjacent opposed ends of the heads being provided with removable and interchangeable similar brackets carrying parts for securing the shoes to the respective heads and carrying interfitting parts of guiding means designed to maintain the brake heads parallel to each other and to the rotary brake disc.

3. Brake mechanism for disc brakes comprising in combinationja brake head having a brakeshoe supportin face, a brake shoe comprising a metal backing plate and a brake lining secured to one face of the plate, and means securing the shoe upon the face of the brake head, said securing means comprising end projections on said backing plate extending beyond the brake lining and having end notches therein, and clamping means for said end projections of the metal backing plate, said clamping means having parts which fit in the end notches and parts which overlie the front face of the end projections of the backing plate, and means for applying endwise and normal-to-facepressure on said clamping means to secure the backing plate to the brake head, said brake head having a supporting and guide elementfor said clamping means providing movement thereof parallel to the backing plate, the means for applying endwise pressure on said clamping means comprising a spring and retaining means therefor carried by said guide element, and the means for causing normal-toface pressur on said clamping means comprising interengaging cam elements on said clamping means and said head which cause said parts which overlie the front face of the backing plate to draw the backing plate against the supporting face as the clamping means moves down on the guide element.

4. Brake mechanism for disc brakes comprising in combination, a brake head having a brakeshoe supporting face, an arcuate-shaped segmental brake shoe carried by the brake head on its said face, the brake shoe comprising a metal backing plate and brake lining secured to one face of the plate, said backing plate having end projections extending beyond the brake lining, and said end projections having end interengagin elements which are symmetrical about a chordal axis of the arcuate segmental brake shoe, and clamping means having mating interengaging parts for the interengaging end part of the said end projections of the metal backing plate, said clamping means also having elements which overlie the outer face of the backing plate projections, and means for securing said clamping means in endwise compression and axial or normal-to-face compression to said brake head, said brake head having a supporting and guide element for said clamping means providing movement thereof parallel to the backing plate, the means for applying endwise pressure on said clamping means comprising a spring and re taining means therefor carried by said guide ele ment, and the means for causing ncrmal-to-facc pressure on said clamping means comprisin interengaging cam elements on said clamping means and said head which cause said parts which overlie the front face of the backing plate to draw the backing plate against the supporting face as the clamping means moves down on the guide element.

JOSEPH H. COOMBES. WILLIAM MANN.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 873,577 Mick Dec. 10, 1907 1,0 0,737 Austin Mar. 19, 1912 1,711,602 Kindler May 7, 1929 1,724,151 Thompson Aug. 13, 1929 1,757,273 Thompson May 6, 1930 1,796,433 Blume Mar. 17, 1931 1,827,081 Gilles Oct. 13, 1931 1,941,656 Blume Jan. 2, 1934 2,236,311 Eksergian Mar. 25, 1941 2, 18,719 Mann Apr. 8, 1947 2,451,326 Eksergian et al. Oct. 12, 1948 2,451,329 Gaenssle Oct. 12, 1948 

